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2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications最新文献

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Resource optimization in the decode-and-forward half-duplex multiple relay-assisted channel 译码转发半双工多中继辅助信道中的资源优化
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641645
A. Agustin, J. Vidal
{"title":"Resource optimization in the decode-and-forward half-duplex multiple relay-assisted channel","authors":"A. Agustin, J. Vidal","doi":"10.1109/SPAWC.2008.4641645","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641645","url":null,"abstract":"The half-duplex multiple relay-assisted channel is investigated, where the relays work under decode-and-forward (DF) in time/frequency orthogonal resources. Achievable rates are optimized with respect to the transmitted powers and with respect to the fraction of time/bandwidth allocated to the relay-receive and the relay-transmit phases. Different transmission strategies associated to different complexities at the receivers are considered. For each case we take into account either the synchronous or asynchronous transmission of the terminals, depending on the availability of channel state information (CSI) in transmission from all links. We find that all the cases can be formulated as a unique convex problem, and we compare the achievable rates thus obtained. We finally derive under which conditions the use of two DF relays brings significant gains over the use of one.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121191023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Particle filtering based on sign of innovation for distributed estimation in binary Wireless Sensor Networks 二值无线传感器网络中基于创新符号的粒子滤波分布式估计
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641684
F. Aounallah, R. Amara, M. Alouane
{"title":"Particle filtering based on sign of innovation for distributed estimation in binary Wireless Sensor Networks","authors":"F. Aounallah, R. Amara, M. Alouane","doi":"10.1109/SPAWC.2008.4641684","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641684","url":null,"abstract":"Distributed estimation is a major feature in wireless sensor networks (WSNs). Recently, hard quantized observations based on sign of innovation (SOI) were used to perform optimal distributed filtering involving thus the SOI Kalman filter (KF)/extended KF (EKF) [1]. In this paper, a SOI-particle filter (SOIPF) is derived to enhance the performance of the distributed estimation procedure. On one hand, the use of the particle filter avoids the imperative linearization in the EKF and on the other hand it guarantees a part of optimality for nonlinear/non Gaussian state models. The SOIPF proposed in this paper is applied in the target tracking context. The experimental results obtained for different simulations demonstrate the good tracking ability of the SOIPF compared to the SOIEKF as well as the consistency of the so given trajectory estimate.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116449619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Dynamic bit allocation and differential quantization in feedback link for robust power allocation in multiuser opportunistic beamforming 多用户机会波束形成中反馈链路的动态位分配和差分量化
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641619
N. Zorba, A. Pascual-Iserte, A. Neira
{"title":"Dynamic bit allocation and differential quantization in feedback link for robust power allocation in multiuser opportunistic beamforming","authors":"N. Zorba, A. Pascual-Iserte, A. Neira","doi":"10.1109/SPAWC.2008.4641619","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641619","url":null,"abstract":"Multi-antenna systems provide advantages in terms of link quality and multiuser access capabilities, which can be achieved by using schemes as multibeam opportunistic beamforming. This scheme only requires partial channel state information at the transmitter (CSIT) in terms of the equivalent channel moduli. This paper deals with the problem of feeding back the CSI from the multiple receivers to the base station (BS) transmitter through limited capacity feedback links. This involves a quantization and a delay that produces errors in the CSIT. In this sense, the proposed scheme in this paper is based on a robust design that takes into account these errors. Additionally, a dynamic bit allocation in the feedback among the users is derived, and combined with differential quantization to minimize the transmit power. It considers both the userspsila sensitivities to the quantization errors and the Doppler frequencies due to the mobility. Simulation results show the benefits from using such schemes.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126355204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robust pilot-aided channel estimator for time-varying OFDM channels 时变OFDM信道的鲁棒导频辅助信道估计
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641659
R. Vigelis, C. Cavalcante
{"title":"Robust pilot-aided channel estimator for time-varying OFDM channels","authors":"R. Vigelis, C. Cavalcante","doi":"10.1109/SPAWC.2008.4641659","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641659","url":null,"abstract":"This paper deals with time-varying channel estimation in orthogonal frequency division multiplexing (OFDM) systems by means of pilot-aided strategies. A robust estimator which does not depend on the channel statistics is proposed. The derivation is based on a constrained filtering approach and particular cases are analyzed. Simulation results are provided in order to verify the better performance of the proposal when compared to estimators reported in the literature.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127573569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An hierarchical approach for inter-cell scheduling in interference-limited cellular networks 有限干扰蜂窝网络中蜂窝间调度的分层方法
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641633
R.B. Moreira, F. Cavalcanti
{"title":"An hierarchical approach for inter-cell scheduling in interference-limited cellular networks","authors":"R.B. Moreira, F. Cavalcanti","doi":"10.1109/SPAWC.2008.4641633","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641633","url":null,"abstract":"Interference management is one of effective means of improving system throughput, which is particularly important for the emerging 4G wireless networks that demand increasing data rates. In order to mitigate the inter-cell interference we evaluate the performance of an hierarchical centralized inter-cell scheduling method which aims at improving the system throughput. The proposed algorithm, which is based on an existing one, besides selecting the BSs allowed to transmit, performs an exhaustive power control in order to find the optimal power levels of transmitting BSs. Simulation results show that the proposed method outperforms classical approaches in terms of spectral efficiency improvements.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"34 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131923676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Information theoretic capacity of the cellular uplink - average path loss approximation 蜂窝上行链路的信息理论容量——平均路径损耗近似
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641679
E. Katranaras, M. Imran, C. Tzaras
{"title":"Information theoretic capacity of the cellular uplink - average path loss approximation","authors":"E. Katranaras, M. Imran, C. Tzaras","doi":"10.1109/SPAWC.2008.4641679","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641679","url":null,"abstract":"In this paper we investigate the information theoretic capacity of the uplink of a cellular system where all base station receivers jointly decode the received signals (ldquohyper-receiverrdquo). Considering a distance depended power-law path loss and a more realistic Rician fading environment, we model a variable cell density network with geographically distributed user terminals. Multiple tiers of interference are considered and using an average path loss approximation model the analytical result for the per cell sum-rate capacity is found. We examine the various parameters that are affecting the capacity of the system. Especially the effect of the user distribution across the cells and the density of the cells in the cellular system is investigated. We validate the numerical solutions with Monte Carlo simulations for random fading realizations and we interpret the results for the real-world systems.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131955944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An infinite user model for random access protocols assisted by multipacket reception and retransmission diversity 基于多包接收和重传分集的随机接入协议无限用户模型
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641580
R. Sámano-Robles, M. Ghogho, D. McLernon
{"title":"An infinite user model for random access protocols assisted by multipacket reception and retransmission diversity","authors":"R. Sámano-Robles, M. Ghogho, D. McLernon","doi":"10.1109/SPAWC.2008.4641580","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641580","url":null,"abstract":"The study of random access protocols has recently regained attention due to new cross-layer schemes such as multipacket reception (MPR) systems and network diversity multiple access protocols (NDMA). Despite their relevance, these two systems have only been simultaneously studied employing finite user population models and considering perfect detection of the active users, which are assumptions only useful in scenarios with low numbers of users and high values of the SNR. The purpose of this paper is to introduce an infinite user population model, valid for scenarios with large numbers of users and finite traffic loads, which allows us to extend the available results on ALOHA MPR protocols to systems that use retransmission diversity (RD). Unlike existing approaches our model includes both the effects of packet decoding errors and the effects of imperfect detection of the active users, which considerably affect the performance of conventional NDMA systems in finite SNR environments. Additionally, the proposed model provides a better approximation to the queuing delay of NDMA protocols than the conventional formula of an M/G/1 queue with vacations. Finally, the proposed algorithm also represents an extension and generalization of contention binary tree algorithms assisted by signal processing tools such as SICTA (successive interference cancellation tree algorithm) and other algorithms assisted by source separation. The benefits of the proposed model are assessed using simulation and analytic results.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132170051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Coding strategies for CDMA packet data networks with reduced rank multiuser detection, ARQ and Packet Combining 基于降阶多用户检测、ARQ和分组合并的CDMA分组数据网络编码策略
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641572
B. Mouhouche, Cédric Artigue
{"title":"Coding strategies for CDMA packet data networks with reduced rank multiuser detection, ARQ and Packet Combining","authors":"B. Mouhouche, Cédric Artigue","doi":"10.1109/SPAWC.2008.4641572","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641572","url":null,"abstract":"Reduced-rank code division multiple access (CDMA) multi-user detection has received a lot of attention recently. The output SINR provided by a reduced-rank receiver depends on the filter rank and is confined between the SINRs of the single user matched filter (SUMF) and the minimum mean squared error (MMSE) receiver. In packet CDMA data networks like HSDPA, the measure of performance is the throughput. Thus, previous results on reduced-rank MMSE receivers SINR cannot be used directly. In this paper, we study the throughput of CDMA data networks using reduced-rank MMSE receivers, automatic retransmission request (ARQ) and packet combining. We derive the expression of the system throughput as the function of the filter rank, the coding rate and the number of retransmissions. We present simulation results to highlight the behavior of the maximum throughput as a function of the filter rank and the coding rate. We then conclude on coding strategies to adopt depending on the signal to noise ratio and the receiver rank in order to maximize the system throughput.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"28 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114047763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Iterative decoding bounds for multiuser multilevel FSK 多用户多电平FSK的迭代译码界
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641583
M. Sharma, J. Portugheis
{"title":"Iterative decoding bounds for multiuser multilevel FSK","authors":"M. Sharma, J. Portugheis","doi":"10.1109/SPAWC.2008.4641583","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641583","url":null,"abstract":"In this work we study joint multiuser detection using factor graphs for an N frequency T user noisy multiple access channel. This channel may model a frequency hopped code division multiple access system. The system is separated in two parts: multiuser detector and a code. We present a factor graph for the multiuser detector and obtain from it extrinsic information transfer (EXIT) curves. Paired with the EXIT curves of low density parity check and repeat accumulate codes, we obtain values for the signal to noise ratio (SNR) that bound the systempsilas performance. The EXIT curves for the codes are presented from the detectors perspective. The results show that rates close to the sum capacity are achievable.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123862723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Optimal training for frequency offset estimation in correlated-rice frequency-selective channel 相关米选频信道中频偏估计的最优训练
2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications Pub Date : 2008-07-06 DOI: 10.1109/SPAWC.2008.4641559
P. Ciblat, P. Bianchi, M. Ghogho
{"title":"Optimal training for frequency offset estimation in correlated-rice frequency-selective channel","authors":"P. Ciblat, P. Bianchi, M. Ghogho","doi":"10.1109/SPAWC.2008.4641559","DOIUrl":"https://doi.org/10.1109/SPAWC.2008.4641559","url":null,"abstract":"We consider carrier frequency offset (CFO) estimation for single-carrier and single-user transmission over a frequency-selective channel. When training is solely devoted to frequency synchronization, it is important to design the training to optimize CFO estimation performance. In this paper we exhibit the training sequence that minimizes the Cramer-Rao bound associated with the carrier frequency offset and averaged over the channel statistics following a correlated Ricean fading channel model. Simulations show significant improvements compared to the standard pseudo-random white training sequence.","PeriodicalId":197154,"journal":{"name":"2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications","volume":"318 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115833017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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